What is an Earth Juice/Maxicrop recirculating res?

In order to feed plants with Earth Juice, it must be mixed and recirculated for at least 24 hours before feeding. The reservoir ought to be light proof and have a lid, though the lid does not need to be air tight. A black 5 gallon bucket and lid will work perfectly and will easily feed 10 plants in 2 gallon pots.

~shabang~ recommends using a relatively high volume aguarium water pump, like the Rio 2100, to keep the mix recirculating. Your author humbly suggests that a bubble curtain and high output air pump will do the trick.